Balancing Equations with Missing Variable

In the equation 2x + 3y = 19, what is/are the variable(s)? Choose the best answer.

• x

• y

• =

• Both x and y are variables

What branch of mathematics deals with equations with variables?

• Algebra

• Geometry

• Calculus

• Physics

Solve for x: 7x + 7 = 21

• x = 7

• x = 4

• x = 3

• x = 2

• 3
• 6
• 12
• 8

Solve:

3(x - 2) = 18

• 6.7

• 4

• 8

• -4

• none of the above

Solve the equation:
-5x = 25

• x = 20

• x = -20

• x = -5

• x = 5

Balance to solve. enter answer as x

Mathematical Equivalence

ON

4x + 7 = 23

• x = 16

• x = 4

• x = 9

• x = 12

3(x - 2) = 18

• 6.7

• 4

• 8

• -4

• none of the above

Find the solution:
10 = 4x - 2

• x = 3

• x = 2

• x = -3

• x = -2